From Gambit wiki

Scheme in a nutshell

Scheme is a dialect of the Lisp programming language developed in the 70s, that inherently supports functional programming but is easily multi-paradigm.

Scheme provides very few primitives defined in its core (known as the "RnRS standard" where "n" is an integer) as the rest is defined in extensions or libraries.

Scheme can be used for any kind of software development and can be learned in a single day thanks to its minimalist yet powerful design. "High order programming" and macros allow the developers using Scheme to write efficient and easily maintainable code, hence Scheme's label as the programming language of choice for many industries as well as academics.

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Literature

An Introduction to Scheme and its Implementation is a practical hands-on guide to Scheme, for people new to software development, as well as for people with a background in general programming languges such as C, C++, Java, Pascal, PHP, etc.